Javascript, and radio buttons - radio-button

Question

OK here is the deal. I have a survey that I am putting up with over 60 questions. I want to make them all mandatory. I really need to know if the group has a value, don't care what it is.
Here is what I have, but it is only giving me the first value.
<function CheckField(myFieldName, myText){
var x=document.getElementById(myFieldName).value;
window.alert(myFieldName + "1: " +x);
. . .. . .
OK so this returns the first value of 5. It does not matter what I select. All I just need to know if they selected something if not I want to mark the question with a different color so the user knows to go back and answer the question.

Answer 1

You can try HTML5 required:
<label><input type="radio" name="option" required /> Option 1</label>
<label><input type="radio" name="option" /> Option 2</label>
You can use it on one radio (per each name), or on all of them (see HTML5: How to use the "required" attribute with a "radio" input field).

Answer 2

Option 1: (EASY!)
Having the attribute "checked" set to "true" would make have a default value either way.
<input type="radio" name="option" />Option 1
<input type="radio" name="option" checked="true" />Option 2
You could also use required instead of checked attribute but some browsers don't support it like Safari.
For info on support:
required
checked
Option 2:
JSFiddle:
http://jsfiddle.net/FE7sK/2/
jQuery(function () {
jQuery('#validateOpt').bind('click', checkRadio);
})
function checkRadio() {
var isChecked = jQuery("input[type=radio]:checked").val();
var booleanVlaueIsChecked = false;
if (isChecked) {
booleanVlaueIsChecked = true;
$('#form1').submit();
} else {
alert("aaa");
}
}